Intel® oneAPI Math Kernel Library Developer Reference - C
This section describes ScaLAPACK routines that allow you to reduce the generalized symmetric-definite eigenvalue problems (see LAPACKGeneralized Symmetric-Definite Eigenvalue Problems ) to standard symmetric eigenvalue problem Cy = λy, which you can solve by calling ScaLAPACK routines (see Symmetric Eigenproblems).
Table "Computational Routines for Reducing Generalized Eigenproblems to Standard Problems" lists these routines.